50
50
FIGURE 14 – NODE ID SELECTION USING A HARDWARE SWITCH READ
Method 2 - Non-Volatile Memory Storage
This method involves the storage of the Node ID
in either a PROM, EPROM, or EEPROM. The
microcontroller simply reads the proper location
and programs the ID value. This method is well
suited for closed networks that are not expected
to expand or are maintained solely by the OEM.
Such examples might include machine control
and automobiles.
Method 3 - Hardwire Daisy Chain
The Daisy Chain method uses an additional wire
running from node to node in a daisy chained
fashion. This type of setup relies on a master
node that uses a fixed ID value that is stored in
the master node's non-volatile memory or by
reading a switch. Once the master programs its
ID value it brings the additional line low.
The
next node that is in line physically detects the low
level on the line and uses a duplicate ID search
algorithm to detect the first available ID on the
COM20051
ADDRESS
DECODER
A15-A0
D7-D0
'LS244
DIP
SWITCH
NID DECODE
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